Brake shoe grinder and gauge



Feb 7, 1939. H. THOMASON BRAKE SHOE GRINDER AND GAUGE Original FiledOct. 5, 1934 5 Sheets-Sheet l Ewan/02" H Tfiamasozz b j iwwmmm Feb. 7,1939. H. THO MASO N 5, I BRAKE SHOE GRINDER- AND GAUGE Original FiledOct. 3/1934 3.Sheets-Sheet 2 [pm for H 7&027705027 7, V H T N I BRAKESHOE GRINDER AND Mm Original Filed Oqt. 3, 1934 s Sheets-Sheet s H 772072205022 54 60 I fl wmmw flzzazzze s -20 adjustably mounted I thereon,

, Patented Feb. 7, 1939 PATENT owl c1:

2,145,902 BRAKE SHOE GRINDERAND GAUGE" Hjalmar Ihomason, Angeles, Calif;

. Application-October 3-, 1934,

Serial No. Masts Renewed November'zs, 1936' 17 Claims. (01.51-241)I'his-inventionrelates to improvements in brake shoe 'grindersandgauges;

object of 'the invention is to provide a devfce for' grinding brakeshoes, such as those used upon autoinobiles,-so as to r'enderthem trulytocor'iforin to the surface of' the brake,

drum with which the brake shoes are-designed to 1 fi flge. r a 2 Morespecifically, an object of the'inv'entio'n is to provi'de a brake shoegrinder which is of such design as-to enable its application to'anyconven- -tional axle, axle housing} or spindle; so' thatth'e samerakeshoe grinder maybe'used to grind the brakeshoesof "-a vehicle regardlessofthedesigrfi offit'saxle, axle housing, or spindle.

Another object of the inventionis to provide a brake shoe grinderh'avinga clamping mechanism 7 adapted tobe applied either "to an axle.an axle busing; or spindle having" a grinding apparatus the" design 7being such that the grindingapparatus maybexmovea inwardly toward thecenter of rotation of the brakeurum against adjustable limitswhich-limit the depth to which the grinding apparatus may 25 grindf thebrakesh'oes.

- further objectof the'invention is to provide 'a brake' shoe. grinderconsisting essentially of a clampingmechanism fOr cIamping'the apparatusupon an axle, spindle, or" axle housing; and'which 30 has the 'grindinfgapparatus removably positioned thereon so thatthe grinding mechanism canbe removed'while the construction is being set up or mounted. To thisenda gauge bar may be mounted on theconstruction for gauging thepositionof'the grinding apparatus, thus enabling I 'to be properly set,after which the grinding apparatus may be reinstalled.

Another object of the invention is to provide 7 :abifake shoegrinderhaving a clamping mechanis'mofsuch design thata micrometer or otherlength measuring instrument may be applied tlirto'iiidicatingithedlameter'bf the brake drum aii'd thusfen'abling' anaccurate setting of the limthe grinder duringlits grinding of the brakeshoes.

I llvi'itl r the foregoing andother objects in view, which will be mademanifest in-the following de- 7 tailedhescription, and specificallypointed out in a thev'appended claims, reference'is had to theaccompanying'drawings for anillustrative embodimeat oftheinventiomwherein: I I

1 is a' 'view in side -'elevation,' parts "being broken awayzsandshownin vertical sectionillus-' t grinding mechanism; becau'seof itsweight,

itingistops which limit the inward movement of trating the improvedbrake shoe grinder and gauge;

Fig. 2 is a'sectional view taken'substantially upon the line 2-2'up0nFig. 1.

Ynism adapted to b e'applied' to the axle. This comprises aforward pairof clamping blocks Ill and H '(see Fig. 3), and a rear pair of clampingblocks l2 and 13. As shown on Fig. 3, the forward pair of clampingblocks have their opposed facesnotched,- as indicated at M, withrelatively shallow notches, whereas the outer sides of these clampingblocks are provided with relatively deep, wide notches 15. Ina similarway the rear pair of clampingblockshave opposed faces provided withnarrow 'or shallow'notches I B and outer notches or recesses 11, whichare relatively deep and broad. These clamping blocks are swiveled orrotatably mounted onvertical standards. The standards for the forwardpair consist of two upper'm'enibers I 8' and I9 having at their lowerturned seats to have the outer broad-notches l5 opposite "one another.

The Y rear clamping 1 blocks" are mounted on standards 24 and25 whichare duplicates of the standards for the forward blocks; At the tops 45and bottoms of the standards there are transverse cross'members', thecross members forthe forward pair being indicated at 27 and 28. Thesestandardsare provided with extensions at their topsand-bottoms'indicated at 29 and 30 which 5 are slidable in slots 3|and'32 in-the crZTss members As a means for holding the standards andcross members-together'the tops and bottoms of the standardsareprovided-with nuts and wash ers indicatd atfl; 5

To effect a horizontal adjustment of the standards and the clampingblocks thereon the upper parts of the forward standards indicated at l8and I9 have a screw provided with right and left hand threads andindicated at 34 extending therethrough. In a similar way the lower parts2| and 22 have a right and left handed screw 35 extending therethrough.These screws 34 and 35 are provided at each end with knurled handles 36and in order to cause the screws to be turned in unison each screw isprovided at one end with a small sprocket, the sprockets being indicatedat 31 and 58. And endless chain 39 passes over both sprockets and thesprockets and chain are enclosed within a cover 55 which connects thetop and bottom cross members 21 and 28. By this construction on turningany one of the four handles 35 which are associated with the forwardpair of clamping blocks the tops and bottoms of the respectivestandards. will be caused to move toward or away from each other inunison.

The standards 25 and 25 of the rear pair of clamping blocks aresimilarly provided with two screws 4! and 42 having handles 33 and withcorresponding sprockets and an endless chain so that when one of thefour handles 43 associated with the rear pair of clamping blocks areturned the standards for the rear pair of clamping blocks will be movedtoward or away from each other in unison. There is no connection betweenthe screws of the forward pair of clamping blocks and the screws of therear pair of clamping blocks so that it is possible to adjust the rearpair of clamping 'blocks independently of the forward pair in applyingthe construction to an axle having a tapered end as shown on Fig. 1. Byvirtue of the rotatable mounting for the clamping blocks not only is itpossible to reverse the positions of the blocks for various sized axlesor spindles but the clamping blocks themselves may accommodatethemselves to the axle. If the axle has an abrupt taper these clampingblocks will seat themselves accordingly. On the other hand, if the axleor axle housing distinguished from tapered, the clamping blocks willseat themselves accordingly.

The forward and rear cross'members are connected in a longitudinaldirection by means of tubular bars 45 and 45 and the cross members aresecured in adjusted position thereon by means of set screws 55. In thisway the distance between the forward setjof clamping blocks and the rearset of clamping blocks can be adjusted for various axles or spindles.These tubular members also extend through transverse members 4'! and 48which are held in adjusted position thereon by means of set screws 59.These transverse members have at their outer ends slotted sleevesindicated at 55, 5!, 52, and 53; Standards for the grinding apparatusindicated at 54' and 55 slidably extend therethrough. The upper sleeves50 and 5i are provided with tightening screws 56 which serve to tightenthese sleeves about the standards to take up wear. They are nottightened sufficiently to cause the sleeves to clamp tightly upon thestandards. Below the lower transverse member 48 there is a yoke 51having split sleeves 58 at its ends sur-. rounding the standards 5and55. These split sleeves are tightened by means of screws 59 which canbe tightened so as to clamp the yoke upon the lower ends of thestandards 54 and 55. A screw 60 is threaded through the center of theyoke and has its upper end 6! swiveled in the bottom of the lowertransverse member 48. By

should be straight, as.

this construction, when the clamping members or clamping blocks areclosed against the axle A, on

'turning screw Bil, standards 54 and 55 can be raised or lowered andcaused to slide through the sleeves 55, 5i, 52 and 53. The tops'ofsleeves 55 and 5! are carefully milled so as to be even with each otherand adjustable collars 62 and 63 are disposed about the standards abovethese sleeves. These collars can be set in adjusted position by means ofset screws 64. The tops of the standards support a saddle 65 having T-shaped slots 65 in its sides and serving to support the motor 51 of Vthe grinding apparatus. This motor'carries bolts on its sides indicatedat 58 which are capable of passing through the entrances to the T-shapedslots so as topermit the grinding apparatus to be removed from thesaddle as an entirety or the motor when in applied sleeve is surroundedby a shroud '15 having an 7 outlet H on top of the motor leading througha swivel 12 to a hose 13 leading to a vacuum pump or fan. The purpose ofproducing the vacuum is to cause the grindings to be withdrawn throughthe outlet '5 I. The swivel also enables the entire apparatusto beturned without twisting the hose E3 or the electric cable 14 whichsupplies the electric current to: the motor. 7 j g The upper tubular bar44 carries an extension l5 which provides a socket for the reception ofan arm :5 on the micrometer 11, the purpose of which will be hereinafterdescribed. On the sides of the saddle there are provided ears 18. one ofwhich has a set screw 19 for adjustably mounting a gauge bar 80. Thisgauge bar may be removed when the grinding apparatus is installed in thesaddle and may be applied on removal of the'grinder to assist in settingthe apparatus.

The bottom surface of the gauge bar is either a distance from the centerof the axle A equal to The operations and advantages of the improvedbrake shoe grinder and gauge are as follows: To

apply the construction the micrometer 11 is first adjusted so as tomeasure the diameter of the brake drum. The micrometer forms no part ofthe present invention, and therefore, its details of construction havenot been disclosed herein. It should, however, be such that onadjustment its ends will simultaneously move toward or away from itscenter. -When the brake drum has been measured the micrometer has itsarm 16 inserted in the socket of extension 15 and by swinging themicrometer about its .arm l5 as a center the high point of the arccircumscribed by the top of the micrometer can be easily ascertained.This high point will be a distance from the center of the axle A equalto the radius of the drum. After the motor or grinding apparatus is inapplied position this is adjusted by means of screw 60 until the bottomof sleeve 69 is just tangent to the are described by the top of themicrometer. When in this position collars 62 and 63 are set so that theywill be touching the tops'of sleeves 5D and "5|.

When the position of the grinder has thus been set the screwliil iscaused to elevate the standards *dius to whichit' is desired to grindthe" brake the lengths of tubular bars shoes, in which casethere-willbe'a small clearanceinthe bottoms of the collars and the topsof the sleeves 50'an'd as shownon Figs. land 2.

The micrometer- I1 is then removed and the con struction is ready toapply to axle A;'- set screws 46 areloose'ned andthe transverse membersfor the frontand rear clamping blocks are adjusted along and so as toproperly position the front pair of clamping blocks V and therear pairof clamping blocks with respect to tl ie particular axle or spindle. Thedevice is then shifted on to the axle or spindle and by rotat-- ing'thehandles forthe various screws the clamping blocks may be caused toengage the sides of the axle and accommodate themselves thereto.

surrounding the axle? ftin'ues while the standards which time the Insome instances it may be necessary to apply the bolt on the end of theaxle to its outer end together with its washer so that the rear pair ofclamping blocks will'have a shoulder on the axle against which they maybear, thus preventing the clamping mechanism from loosening on thetapered axle during rotation. The device is then ready to proceed withthegrinding.

' With the grinder in elevated position, that is, slightly above thelimit determined by the set collars 62 and 63, a cut' is taken'on thebrake shoes This grinding action con- 54 and 55'are graduall'y' loweredby means of screw until the collars '62 and 63 engage the tops ofsleeves 50 and SI at grinding is completed. When completed the brakedrum engaging'surfaces of the shoes will be ground in conformity to the'sirable to take oif the the mechanism is being clamped upon the. axle 1brake drum, after which the apparatus is removed from the axle.

I Because of the fact that the motor of the grinding apparatus is quiteheavy it is frequently degrinding apparatus while and while it is beingset. This can-be easily acgrinding apparatus is 80 is installed. The

distance from the center of the axle A equal to thedistance thatthebottom ofsleeve 69 is from the center'of the axle plus a predeterminedincre- 'ment, such as for'example, .015 inch. Conse 'quently, by knowingthis slight incrementthe bottom surface of the gauge bar may be used asa-'-gaugefor gauging the positions to which the ecnar sz and as shall beset just as well as-the bottom surface of sleeve 69. When the gaugeproperly positioned. Y Various changes "to be'clamped upon an axle barhas been used tofacilitate'setting of the appa ratus' it may be removedand upon application of the grinding apparatus to the saddle it will beconstruction without departing from the spirit or scope of the inventionas defined by the appended claims.

, tion, motor driven grinding means, clamping means adjustably connectedthereto and adapted or spindleso as to swing the grinding means aboutthe axle or spindle as a center, said clamping means including swiveledaxle or spindle engaging blocks whereby the blocks may accommodatethemselves to straight or tapered axles and spindles.

2. A brake shoe grinder comprising, in combination, motor drivengrinding means, clamping -means adjustably connected thereto and adaptedto be clamped upon anaxle or spindle so as to may be made in the detailsof 3 Swing the grinding means about the axle or spindle as a center,said clamping means including swiveled axle or spindle engaging blockswhereby the blocks may accommodate themselves to straight or taperedaxles and spindles,'each block having a plurality of differently sizedengaging faces whereby on swiveling the blocks about, the blocks may becaused to engage diiferently sized axles and spindles.

3. A brake shoe grinder comprising a motor driven grinding means,standards connected thereto, and a clamping means adapted to be clampedabout an axle or spindle slidably mounted upon the standards, saidclamping means including opposed axle or spindle engaging blocks, andmeans for forcing the blocks toward each other.

4. A brake shoe grinder comprising a motor driven grinding means,standards connected thereto, a clamping means adapted to be clampedabout an axle or spindle slidably mounted upon the standards, saidclamping means including opposed axle or spindle engaging blocksrotatably mounted so as to accommodate themselves to straight or taperedaxles or spindles, and means i for forcing the blocks toward each other.

' 5. A brake shoe grinder comprising a motor driven grinding means,standards connected thereto, and a clamping means adapted to be clampedabout an axle or spindle slidably mounted upon the standards, saidclamping means including a forward pair of opposed spinthereto, aclamping means adapted to be clamped n,

about an axle or spindle slidably mounted upon the standards, saidclamping means including a forward pair of opposed spindle or axleengaging blocks, and a rear pair of opposed spindle or axle engagingblocks, and means for forcing the blocks of each pair toward each otherindependently of the blocks of the other pair, said blocks being mountedfor rotational movement.

j 7. A brake shoe grinder comprising a motor driven grinding means,standards connected thereto, a clamping means adapted to be clampedabout an axle or spindle slidably mountedupon the standards, saidclamping means including a forward pair of opposed spindle or axleengaging blocks, and a rear pair of opposed spindle'or axle engagingblocks, means for forcing the blocks of each pair toward each otherindependently of the blocks' of the other pair, and means for adjustingthe blocks of one pair toward or away from the blocks of the other pair.

8. A brake shoe grinder comprising a forward clamping means, a rearclamping means, means adjustably connecting the forward clamping meansand the rear clamping means together, cross members on the connectingmeans, standards slidable on the cross members, a saddle on thestandards, motor driven grinding means removably mounted upon thesaddle, and settable collars on the standards engageable with one of,adjustably connecting the forward clamping means and the rear clampingmeans together, cross members on the connecting means, standardsslidable on the cross members, a saddle on the standards, motor drivengrinding means removably mounted upon the saddle, and screw meansassociated with one of the cross members for advancing or retarding thegrinding means toward or away from the clamping means.

10. A brake shoe grinder comprising a forward clamping means, a rearclamping means, means adjustably connecting the forward clamping meansand the rear clamping means together,

cross members on the connecting means, standards slidable on the crossmembers, a saddle on the standards, motor driven grinding meansremovablymounted upon the saddle, and a gauge bar removably mounted uponthe saddle for gauging the position of the grinding means when thegrinding means is removed from the saddle.

11. A brake shoe grinder, comprising in combination a motor drivengrinding means, a clamping means adapted to be clamped upon an axle orspindle, an adjustable supporting and connecting means connected betweenthe clamping and the grinding means and operative to vary the radialdistance between the axis of the axle or spindle and the grinding means,a settable means associated with the adjustable supporting andconnecting means and serving to limit the inward movement of thegrinding means to the radius to which the brake shoes are to be ground,the grinding means being adapted to swing on the axle or spindle as acenter, the adjustable supporting and connecting means being adapted toinitially position the grinding means at a greater radius from the axisof the axle or spindle than that defined by the said settable means,whereby the brake shoes may have their outside periph eral portionsground until the limit defined by the settable means.

12. A brake shoe gauge comprising a rigid structure forming a standardadapted to straddle an axle or a spindle, a gauge bar adjustablymounted'on the standard, a supporting means connected to the standard, aplurality of pairs of blocks having seating surfaces, each rotatablymounted on a part of the said supporting means, an adjusting device forthe said supporting structure to clamp the blocks to an axle or aspindle, the blocks beingadapted to rotate to accommodate themselves tostraight or tapering axles and spindles.

13. A brake shoe gauge comprising a first rigid standard adapted tostraddle an axle or a spindle, secondary standards adjustable on thefirst mentioned standard, rotatable clamping blocks mounted on thesecond standard and arranged in pairs, the blocks having complementaryfaces to engage opposite sides of an axle or spindle and axis of beingadapted to adjust themselves to straight or tapered axles or-spindles, agauge bar adjustably mounted on the first standard, means to adjust thesecond standards relative to the first standard to position the gaugebar parallel'to the axis of the axle or spindle.

14. In abrake shoe gauge comprising a plurality of pairs of shaftsforming secondary standards, each of the shafts having a rotatableclamping block thereon, said blocks having complementary faces to engagethe opposite sides of an axle or spindle and by their rotationaccommodate themselves to a straight or tapered axle or spindle, meansto simultaneously adjust opposite ends of the said shafts forming thestandards to clamp the blocks to an axle or spindle, a gauge bar, asupportingrmeans therefor operatively connected to the secondarystandards and having means for adjusting the gauge bar radially inrespect to the axle or spindle clamped by the said blocks.

15. A brake shoe gauge comprising in combination a plurality of pairs ofsecondary standards, each having a cylindrical portion with a rotatableclamping block thereon, each pair of blocks having complementarysurfaces, means to adjust each pair of standards to clamp the blocksthereof on an axle or spindle, each pair of blocks by its rotation beingadapted to accommodate themselves to straight or tapered axles orspindles, a cross member adjustably connected to each of 'the secondarystandards and primary standards adjustable on the crossmembers andhaving a gauge bar thereon whereby the gauge bar may be adjustedradially and parallel to the the axle or spindle clamped by the saidblocks. 1

16. A device of the class described comprising a gauge bar, standardsconnected thereto, and a clamping means adapted to be clamped about anaxle or spindle slidably mounted upon the standards, said clamping meansincluding two opposed pair of axle or spindle-engaging blocks,

and means forforcing the blocks of each pair toward each otherindependently of the blocks of the other pair.

17. A device of the class a pair of standards on which a gauge bar or agrinder may be mounted, clamping means adapted to be clamped about anaxle or spindle slidably mounted upon the standards, and means formounting a micrometer adapted to measure the diameter of a brake drum onthe clamping means in such a manner that the center of the diametermeasured by the micrometer may be positioned coincident With the axis ofthe axle or spindle about which the clamping means'is adapted to beclamped. Y

I-IJALMAR THOMASON,

described comprising

